code: def test_show_without_targets_specified(tmp_dir, dvc, scm, file):
      params_file = tmp_dir / file
      data = {"foo": {"bar": "bar"}, "x": "0"}
      params_file.dump(data)
      dvc.stage.add(
          name="test",
          cmd=f"echo {file}",
          params=[{file: None}],
      )
  
      assert dvc.params.show() == {"": {"data": {file: {"data": data}}}}
  
file_path: dvc/tests/func/params/test_show.py
imports: from os.path import join
  import pytest
  from dvc.repo import Repo
  from dvc.repo.stage import PROJECT_FILE
label_desc: Use image node_id 11 for calling a global function with example usage: test_show_without_targets_specified(tmp_dir, dvc, scm, file) without return types